Abstract
Abstract A new mechanism is proposed for homogeneous nucleation of crystalline phases via density fluctuations in undercooled melts. This process leads to the formation of crystalline nuclei of the critical size by a diffusionless transformation during relaxation of density fluctuations in the undercooled liquid. The proposed mechanism avoids the postulation of a distribution of energetically unfavourable sub-critical nuclei, as was required by earlier formulations.
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